I study how human land use and climate change affect the structure and functioning of natural and managed ecosystems. I am currently examining how climate change along with increasing carbon dioxide and ozone concentrations interact to affect agroecosystems. In turn, agroecosystems influence regional energy, water, and carbon budgets. This work will help us predict how large-scale agriculture will respond to future environmental changes so that we can maintain food and water security. I am also studying the potential environmental impacts of biofuel energy crops on regional water budgets. This will help us determine which lands are best used for food or for alternative energy crops.